复杂应力状态下TBM刀盘裂纹应力强度因子分析

发布时间：2018-06-08 05:31

本文选题：TBM刀盘 + 应力强度因子　；参考：《哈尔滨工程大学学报》2017年04期

【摘要】：为了预测全断面岩石掘进机(tunnel boring machine,TBM)刀盘的疲劳寿命,本文对其裂纹尖端的应力强度因子进行了研究。以某水利工程的刀盘为研究对象,采用基于子模型技术的有限元法分析复杂应力状态下刀盘裂纹的应力强度因子,并给出了不同裂纹参数对应力强度因子的影响规律,为刀盘裂纹扩展寿命的预测提供输入条件。分析表明,当裂纹位置角为45°或135°时,裂纹尖端的等效应力强度因子最大,对结构损伤最严重;形状比对K_Ⅰ值影响最显著,形状比越大,尖端K_Ⅰ值相差越大,在深度方向的扩展趋势也越强;K_Ⅰ、K_Ⅱ及K_Ⅲ值均随裂纹深度的增加而增大,裂纹尖端最深处以张开型扩展形式为主,而表面点则是3种开裂形式并存。
[Abstract]:In order to predict the fatigue life of tunnel boring machine TBM cutter, the stress intensity factor at its crack tip is studied in this paper. Taking the cutter head of a water conservancy project as the research object, the finite element method based on sub-model technique is used to analyze the stress intensity factor of the cutter head crack under complex stress state, and the influence law of different crack parameters on the stress intensity factor is given. The input condition is provided for predicting the crack propagation life of cutter head. The analysis shows that when the crack position angle is 45 掳or 135 掳, the equivalent stress intensity factor at the crack tip is the largest and the damage to the structure is the most serious, and the shape ratio has the most significant effect on the KI value, and the larger the shape ratio, the greater the KI value at the tip. The stronger the propagation trend in the depth direction is, the higher the values of KI, KII and KIII increase with the increase of the depth of the crack. The deepest crack tip is mainly characterized by open propagation, while the surface point is coexisting with three kinds of cracking forms.
【作者单位】：福建工程学院机械与汽车工程学院;大连理工大学机械工程学院;
【基金】：国家重点研究发展计划(2013CB035402) 福建省自然科学基金项目(2015J01181) 2014年福建省产业技术联合创新专项资助项目(闽发改高[514]号)
【分类号】：O346.1

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